JavaScript

JavaScript Guide https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide Comments // a one line comment /* this is a longer, * multi-line comment */ Declarations # Declare variable, optionally initialize it to a value var a = 1; # Declares a block-scoped, local variable, optionally initializing it to a value. let b = 2; # Declares a block-scoped, read-only named constant. const c = 3; A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($).